Lawn-mower sharpener



June 4, 1929. E. EBERHART LAWN MOWER SHARPENER Filed Aug. 27,; 1925 3Sheets-Sheet .IH Irl 'l Il I n l il- IMQ, m HIIMJIN 1 l f 1 ,l l: MIL 1,MQHVIVI i-- .,i.-.....`-,.,.,w\..1\---- .M QA

June 4, 1929. E,v EBERHART 1,715,696

LAWN 'MOWER SHARPENE'R Filed Aug. 27, 1925 5 Sheets-Sheet' l N V EN TOR.Bg/1@ [sm/Mfr A TTORNE Y.

June 4, 1929. E. EBERHART LAWN MOWER SHARPENER Filed Aug. 2v, 1925 :ssheets-sheet ff n/55 54 IN VEN TOR [De/7A [5f/em??? Patented June 4,1929.

i IUNITEDw'STAESL ',EDGAR Eisenmann, or' oRnvILLE, 'oHIof ,f"LAWN-Morvan smmrmnn.v l

` YApplicationnieu August 27, 1925. seriainatrama l This inventionrelates to .lawn mower l sharpeners, and has for its general object theprovision of'an improved lawn mower sharpener fco'nstruction adapted ifor `sharpening both the helical and straight blades-of` the mowerinfaneasy and effective manner.,

'Thegabove and other objects willjbe morev readily understood. byreference Vto thef accompanying drawings, illustrating one` embodimentthereof, and to the following Vbrief description of the device shownthereshown .and described. f

' Of theaccompanying drawings:

i Figure 1 is a plan of device embodying the invention andillustratingthe rotary cutter.

of a-lawnv mower therein;

Figure 2 is a front'elevationthereof;

A' Figure 3 is an end elevation thereof;

Figure 4'is a detail section illustrating Y cooperation ofthejhelical'blade` vwith the f grinder Figure 5 is a plan illustratingthe device with a straight cutter blade therein;

Figure 6 is a rear elevation thereof; and Figure, 7 is an end elevationthereof.v Referring to the drawings, 10, 10 indicate suitable supportson which are mounted in parallel spaced apart relation a bar 11 and abar 12, the latter having mounted thereon a rod 13 on which is slidablyand pivotally mounted, as at 13a, 13a, a frame comprising separable endbrackets 14, 14 adjustably sesured together by rods 15, 15, telescopingin sleeves 16, 16, and adapted to be secured in adjusted relationshipsby set screws 16a, 16a, brackets 14 being formed as at 17, 17 so thatthe frame is slidable on bar 11 when in operative position forsharpening.l

, On bar 1l there are provided brackets 18,

18 in which is journaled a shaft 19 havingy thereon a grinder 20 withrespect to which the above frameis slidable as a unit to move a blademounted therein relativelyof the grinder.` Any suitable means may beemployed to drive grinder 20, a pulley 21 being for grindings, enclosingthe lower portion of Y grinder 20, and from the bottomof which.`

here shown which may be driven by a belt'22 connected to any suitablesource ofA power. Mounted on one`bracket'18 is a receptacle 23 leads aconductoror chute 24 by whichthe a grindings are removed from themachine.

Receptacle' vor casing 23V has a slot 23a thereon on one side `ofgrinder 20,*so that a y.sufliciently tov provide Vblade being sharpened;f i For Vmounting a rotary cutter such as in-` dicated at 26 in theslidable frame, there is vIt is understood 5that .the invention-.is rnot llimited to the specific 4form `thereof,-

, arms 28;

work rest may be vadjustably bolted thereon, rest 25 consistingina`ngerfadjusted so as to project Vforwardly of the grinder 20 a rest forjthe cutter;

pivoted on' each bracketV v14l at 27; an arm 28 having a cutter spindlereceivinggaperture- 2 9 "therein,V aperture 29. being 'f'formed f with aV-shapedportion29 whereby itis ac laptechz rotatlvely to receive cutterspindles of'vari-VA ousdiameters, a set screw '3Q being threaded intovthe ,aperture to .position the spindle therein. Y Each arm 28 isformedmwith an upf wardlyk bent portion `281 on itslowerend arrangedtoprevent ,endwise playjof the rotary cutter in vapertures29.

14, into engagement with aneXtension v33 on y Y u Y Arm28 vi sadjustable towardI and from the, grinder to` I permit` operation thereofon vcutters -ofv kdifferent diameters, a pair of setscrev1 vs f p31,31Jbeing threaded through the armsof a`I U-shaped bracket 32,integral'with brackets f The operation of therdevice for Vgrinding i.

28. The frame is then swung down onto bar 11 and screws are so adjustedas to present the cutter blade to ,grinder 20 and on rest 25 in themanner shown in Figure 4.

Grinder 2O is then driven in the direction ofV the arrow, thus byfriction on the blade causing it to hug rest 25. u then moved back andforth until thelblade is sharpened, the cutterbeing caused, to ro-v Theframe istate by engagement of the blade with the A, Y

grinder and rest so that thev edgey of the blade will be presented togrinder y20` throughout its length. After the irstblade is sharpened,the frame may be swung back, f

'the cutter Vturned and the frame again l brought-V down onv bar 11 sothat another peated ,and so on until all-theV blades are sharpened.. 7,.p .Y

"blade is engaged onrest.25,`whereupon`they above described sharpeningoperation is relio It is desirable to providey means whereby thestraight blade of a mower may be sharpened inthe device.

ous adjustingV instrumentalities described above may be employed forthis purpose. This attachment comprises an adjustable rod comprising arod 34 telescoping into a sleeve 34a havinga set screw 35 thereon, therod being adapted to be seeuredii'n apertures 29 of arms 28 as will beunderstood; On the rod includingvparts 34and 34a there is proabovedescribedv into the frame whi'liel swinging back'off of barll' vandtheadjustment`V thereof, as will be understood from. the fore#V going,may be accomplishedfafter the framefv hasY been swung backv onA bar1,1?, setVV screws" vided'apairot pivoted brackets 36, y3G` havingscrews 37, 37 therein for engagingvin' The present inventionA hasdevised an attachment wherebythe vari- Y cette' 48 Vrotary cuttersagainst said EDGAR Esiste-HART,

31 and 50 being adjusted for this latter pur pose. v

It will appear from the foregoing that a simple effective constructionhas been provided for being readily adjusted to receive and sharpenrotary mower cutters and a simple, effective attachment vhas beenproconstruction and readily adjusted to support a straight cuttertherein for grinding.' Modiiicati'ons 'of the invention vkmay be re-ysorted to without departing-trom the spirity thereof or the ,scope ofthe appended claim,-

'lVhat is claimed is:

vided, adapted to be received in the abovel Y A Sharpener for lawnmowers, comprising` a rotary grinder, a workf rest adjacent thereto," aframe slidable longitudinally with re! spect tothe grinder, said framfeincluding' relatively adjustable end brackets, a rodenv which one si'deofV the rame is pivoted and slidable, a bar on which th'e'free side ofthe" framevis slidable inoperative relation toAj lthe cutter, an armpivotedfv on eachbracket,

said armhaving an aperture 'therein means cooperating therewith torotatively receive the spindles of-iotary cutters, and meansforadjusting saidfarms from and* toward the grinder to position bladesof said grinder and. on said rest.

